题目内容
In the long discussion of water on the Moon, a new study contradicts(与……相矛盾)) some recent reports that say the Moon had water at the time of its formation. A group of researchers reported in the journal Science that when the Moon was created, some 4.5 billion years ago, there was not much hydrogen(氢气) on it, and therefore no water.
The researchers surveyed and evaluated this by analyzing chlorine isotopes(氯同位素) found in lunar rock samples from Apollo missions. The range of chlorine isotopes in lunar samples was 25 times that found in samples from Earth.
If the Moon had significant levels of hydrogen, as Earth did, this range would have been far less, said Zachary D Sharp, a scientist in the Department of Earth and Planetary Sciences at the University of new Mexico and the study’s lead authour.
The chlorine would have stuck together with hydrogen, forming compounds like hydrogen chloride, and escaped from the Moon’s surface, he said. The abundance of chlorine indicates a lack of hydrogen and water.
“ The amount of water on the Moon was too low for life to possibly have existed there,” he said.
Most scientists believe the Moon was formed when a large object stuck Earth, breaking off a chunk(a vast piece) that has since orbited Earth.
On Earth, goes one theory, water was released as steam form molten basalts(玄武岩) over time, eventually forming bodies of water.
“An understading of whether the Moon was dry or wet will help us understand how water appeared on Earth,” Dr Sharp said.
A new study indicates that _____ on the moorn.
A. there is plenty of water B. water is unlikely to exist
C. water existed in the past D. there is a little water now
The author would like to tell us ______ through the sixth paragraph.
A. why there is no water on the Moon B. how the Moon was formed
C. when the Earth struck the Moon D. where the Moon orbited
Which is NOT true according to the passage?
A. Zachary D. Sharp, a scientist of New Mexico was in charge of the new study.
B. Chlorine isotopes in lunar samples are 25 time larger than those on the Earth.
C. The more aboundant chloride, the shorter hydrogen and water.
D. The new study is benificial to understand how water appeared on Earth.
What can we learn from the passage?
A. There is enough water on the Earth.
B. Hydrogen chloride easily escaped from the Moon’s surface.
C. The Earth had significant levels of hydrogen.
D. Water on the Earth is directly from molten basalts.
【小题1】B【小题1】B【小题1】B【小题1】C
解析:
略
Mr. Brown worked in a factory of a small town. He had been there for twenty years before one day he was sent to the capital for important business. He was quite excited because he had never been there before. Before he set off, he asked his wife and three daughters if they wanted him to buy something for them in Lon-don. Mrs. Brown began to think it over and then she said she wished her husband would be able to buy a nice umbrella for her, and so did their three daughters. As he was afraid he would forget it, he drew an umbrella on his hand. To his regret, he lost it at the station.
On the train Mr. Brown sat opposite to an old woman. The woman’s umbrella was so nice that he carefully looked at it and said to himself not to forget to buy a few umbrellas like it. When the train arrived at the station in London, he said good-bye to the old woman, took his bag and her umbrella and was going to get off.
“Wait a minute, sir,” shouted the old woman. “That’s my umbrella!”
Now Mr. Brown noticed that he had taken her umbrella. His face turned red at once and said in a hurry, “Oh, I’m very sorry, Madam! I didn’t mean it!”
Seven days later Mr. Brown left the capital. To his surprise, he met the old woman and sat opposite to her again. Looking at the four umbrellas, the old woman was satisfied with herself. “It seems that I had a better result than the other four women.” She thought.
【小题1】We can learn from the passage that Mr. Brown was ______.
A.a conductor | B.a worker | C.a thief | D.an umbrella maker |
A.his ticket | B.his bag | C.his drawing | D.his umbrella |
A.Because he was lost in thought. |
B.Because it was much like his own umbrella. |
C.Because he thought the woman would not notice it. |
D.Because the woman misplaced it beside Mr. Brown. |
A.surprised | B.angry | C.fortunate | D.sad |
A.He picked them on the train. | B.He brought them from his small town. |
C.He bought them in London. | D.He stole them from four women. |
Mr. Brown worked in a factory of a small town. He had been there for twenty years before one day he was sent to the capital for important business. He was quite excited because he had never been there before. Before he set off, he asked his wife and three daughters if they wanted him to buy something for them in Lon-don. Mrs. Brown began to think it over and then she said she wished her husband would be able to buy a nice umbrella for her, and so did their three daughters. As he was afraid he would forget it, he drew an umbrella on his hand. To his regret, he lost it at the station.
On the train Mr. Brown sat opposite to an old woman. The woman’s umbrella was so nice that he carefully looked at it and said to himself not to forget to buy a few umbrellas like it. When the train arrived at the station in London, he said good-bye to the old woman, took his bag and her umbrella and was going to get off.
“Wait a minute, sir,” shouted the old woman. “That’s my umbrella!”
Now Mr. Brown noticed that he had taken her umbrella. His face turned red at once and said in a hurry,“Oh, I’m very sorry, Madam! I didn’t mean it!”
Seven days later Mr. Brown left the capital. To his surprise, he met the old woman and sat opposite to her again. Looking at the four umbrellas, the old woman was satisfied with herself. “It seems that I had a better result than the other four women.” She thought.
【小题1】We can learn from the passage that Mr. Brown was ______.
A.a conductor | B.a worker | C.a thief | D.an umbrella maker |
A.his ticket | B.his bag | C.his drawing | D.his umbrella |
A.Because he was lost in thought. |
B.Because it was much like his own umbrella. |
C.Because he thought the woman would not notice it. |
D.Because the woman misplaced it beside Mr. Brown. |
A.surprised | B.angry | C.fortunate | D.sad |
A.He picked them on the train. |
B.He brought them from his small town. |
C.He bought them in London. |
D.He stole them from four women. |